136 MIDDLESEX FLORA. 



A. ebeneum, Ait. 



Xot uneomtuou. "Var. serratum, Gray, . . . Maiden, Nov., 



1872." G. E. Davenport, in Catalogue of tlie Davenport Herbarium. 

 A. thelypteroides, Miehx. 



Medford (L. L. Dame) ; Melrose (F. S. Collins) ; Dracut (Dr. C. 



W. Swan) ; Groton (C. W. Jenks). Not common. 

 A. Filix-fcemina, Bernh. Lady Fern. 



Common and variable ; the only form seemingly worthy a special 



i-ecognition being the following. 

 A. Filix-foemina, Bernh., var. Michauxii, Mett. (var. angustum, 



Eatou). 



Medford and Sudbury (G. E. Daveni)ort) ; Maiden (F. W. Moraudi). 

 Phegopteris, Fee. Beech Fern. 



P. polypodioides, Fee. 



Maiden and Melrose (F. S. Collins) ; Medford and Ashby (L. L. 



Dame); Waltham List; Somerville (E. H. Hitchings). Not 



common. 

 P. hexagonoptera, Fee. 



Medford (G. E. Davenport) ; Maiden and Melrose (F. S. Collins) ; 



Groton (C. W. Jenks). Not common. 

 P. Dryopteris, Fee. 



Arlington Heights (\Vm. Boott) ; Melrose (F. W. Morandi). Very 



rare. 



AspiDiUM, Swartz. Shield Fern. Wood Fern. 

 A. Noveboracense, Swartz. 



Common. 

 A. Thelypteris, Swartz. 



Couunon. 

 A. cristatum, Swartz. 



Rather common. 

 A. cristatum, Swartz., var. Clintonianum, Eaton. 



Maiden (F. W. Morandi) ; Arlington (Mrs. P. D. Richards). 

 A. marginale, Swartz. 



Common. 

 A. spinulosum, Swartz. 



Rather common. 

 A. spinulosum, Swartz., var. intermedium, Eaton. 



Ashby (L. L. Dame) ; Newton and Maiden (G. E. Davenport) ; 



Billerica (Dr. C. W. Swan). Not quite so common as the type. 

 A. spinulosum, Swartz., var. dilatatum, Horneman. 



Groton (C W. Jenks) ; Maiden and Melrose (F. S. Collins). This 



variety does not in the county assume its most higlilj^ developed 



form. 



